Welcome on the forum Hunter. Since your build does not take advantage of any of the CN9-D specificities (double ballistic or big engine) and the CN9-D has a smaller torso twist angle (90° instead of 100°), it would be better to make it on a CN9-A chassis (like this one).
This is a build completely worth while! Not to strong but it is meant to be a light destroyer! Just buy the PB and put his engine in it!